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Sleep Med. 2009 Apr;10(4):479-89. doi: 10.1016/j.sleep.2008.04.011. Epub 2008 Aug 26.

Sleep patterns among rural Chinese twin adolescents.

Author information

1
Northwestern University Feinberg School of Medicine, Chicago, IL, USA.

Abstract

OBJECTIVE:

To examine sleep patterns and influencing factors (age, gender, Tanner Stage, weekday vs. weekend, and pre-sleep activity) among rural Chinese adolescents.

METHODS:

This is a prospective study among 621 adolescents aged 11-20 years (341 males) using both a questionnaire and sleep diary to obtain bedtime, wake-up time, sleep latency, and total sleep time (TST).

RESULTS:

The median TST was 8.6h on weekdays and 9.4h on weekends. Despite absence of late night social pressure and computers, a U-shaped TST pattern was observed across age and Tanner Stage, with a nadir around age 15-16 years or Tanner IV. Bedtimes became progressively later with age and Tanner Stage, while wake-up time was considerably earlier for school students or up to Tanner IV. Later wake-up times and longer TST on weekends were seen in school students, but not in non-school adolescents (>17 years). Pre-sleep activity, like reading or studying, was related to later bedtime, earlier wake-up time, and shorter TST in both genders.

CONCLUSIONS:

Age, Tanner Stage, and pre-sleep activity affected sleep patterns in this sample of rural Chinese adolescents. Later bedtime coupled with earlier wake-up time associated with academic demand appear to be important contributors to sleep loss among school students.

PMID:
18752997
PMCID:
PMC2753967
DOI:
10.1016/j.sleep.2008.04.011
[Indexed for MEDLINE]
Free PMC Article

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